2 Copies with synchronous replication are required to ensure highest uptime of your instance
3rd copy in a different seismic zone which is atleast 500KM away from primary datacenter. This will ensure disaster recovery in case of any major outages in the Primary DC.
4th copy is a backup kept to ensure data is safe from real time integrity issues. It is kept in a different Datacenter in the same city as the Primary DC.This 4th copy can also be upgraded to zero data loss Infrastructure.
Cloud4C a venture of CtrlS Datacenters with Tier 4 datacenters at Hyderabad, Mumbai and New Delhi along with the Middle East and US. We are opening soon in 17 countries across the globe.
100% Uptime since 6 years of Inception.
The CtrlS datacenters are Tier 4 certified and provides 99.995% uptime guarantee, less than 22 minutes of downtime in a year and N+N redundancy. It has ISO-20000-1, ISO-27000-1 and BS 25999 certifications.